Artificial tooth.



' J. P. GOMES.

' ARTlFlCIAL TOOTH.

' APPLICATION FILED FEB. 8. 1916.

Patented July 15, 1916.

Imam? m 35 plied thereto.

- onBRooKL'YN, NEW-YORK.

' 1 ARTIFICIAL roo'rrr.

To all'whom z't'ma Jconcem':

which the following is (a specification.

This invention relates to an' improvement in artificial teeth, and-"more particularlyto themea'ns of securing'the-facing of 'a tooth to the metal or other backing;

One ofthe objects is to provide a tooth having a structure/formed in-theback of the tooth orthe surface which coacts with" the backing, which structure is-equallyt well adapted for front teeth as well as bicuspids and molars. i A further object is to provide an interlocking engagementbetween the tooth and the backing and to avoid" weakening the body of the tooth by the undercut cavities for; the backing member.

' A practical embodlment of" my invention is represented in the accompanymgdrawtionbf a front tooth and backing showing my improved means for fastening them together.

Fig. 3 represents arear elevationbf the tooth, Fig. tirepres'ents a rearand side. ele

vation of the backing:- Fig. 5 represents a" plan view of amolar with the backing ap -'1 Fig, 6 represents a similari' view with the backingremoved. Fig. 7 rep; resents an inverted plan view of the baok..-- ing. F ig.- 8 represents a'vertical section of'lai molar and backing. Fig. 9 represents a 40 similar view with the backing. removed. Fig. 10' represents a plan ,view of a 'bicuspid showing a modified form of fastening means. Figpll represents an inverted'plan view of the backing which coacts with theiblicu-spid, and Fig- 12 represents a vertical sectlo'n of a bicuspid and its backin'g. I

In Figs. 1 to l 'nclusive, :I' have shown a backing having a front toothor facing applied thereto, while Figs. 5 to 9 inclusive I show the same structure. with a molar applied to a backing. Thus it will be seen that the body of both the front tooth facing and the molar being widely different, my 1mproved structure. is equally well adapted for Figure 1 represents" a vertical centrai'se- Fig. 2 represents a similar view" 30 showing the tooth-and backing separated.

mainta ning being formed in the-largest bulk ofporc'elain .upward pre's surei l inclusive, the tooth shown 100, face 14 inclined, which surface-is provided- Patented-July -l aiaaot filed February 8, 1916. Serial No. 76,943.

any tooth facing that may applied to .a

backing in crown, bridge or other work.

In Figs. 1 to 4' inclusive, the tooth or facing'is denoted by 1, and is provided upon its rear surface .2 with one or niore shallow cavities 3,.which-are undercut-seas toform a wall 4. The surface 2Qis also provided w1th arledg'e 5 extending: across the-tooth,

which. ledge is preferably undercut,' asv shown at 6, and has'formed-thereinone or more sockets? A backing1j8 ofgmetal. or

= 4 UNITED A NT OFFICE-F JOSEPH 1? comes, on NEW YoRK', N..'Y., ASSIGNOR or swarm-mac. ABBOTT BUSH,

other suitable material is'iprovided withone or more prongs 9,: whichifare adapted to "enter the'sockets .7 the. undercut ledge 5.

The backing: 8"is-Lprovidedgwith-fa beveled edge 10, which. is adapted t'o-fit} z the vundercut ledge": 5. v Clfhe"backing: is also 'provided H with; one or more squared; hooks 1:1, the-freeend s of wliich.:.are adapted" to enter the; cavlties and engage the wall f4 of'thetooth.

These hooksl-l l' are preferably formed with sharp or' squared edgessofas to obtain a firmer grip in the'cement'12,*with which the cavities'are filled when; the'b'a'cking is a'p.--;

plied to the tooth. E "In practice,- the cavities; 1*. .3 and socketsf aitescantily filled with cement .12 and thetooth or,facingisJplaced "in position with theiprongs'f91entering .the i f sockets-g7 I The hooks '11 are "pressed-into the 1 cement} 12in the cavities 3,- until the f s'urface 2 bears against the backing-8', whenlthei tooth.

shed upwardly causing the prongs the s'ocketsv7i;and -the. free ends of.

en age the walls-4, thereby "the? shallow cavitiesand soc atQHcOntacting-face; 1 Thus; it will be the strengthflof the tooth .is1 p g..,

'ets' of the tooth, thus -presenting' a tooth wh1ch;

may be ground witho'ut making the tooth- .thin and without the pos'sibilityof-the toothbeing .splitunder the strain incidentfto the In F g i5' 9 herein is a molar 13, and-hasitsupper surwith the shallow cavities 3,"theledge 5, and

adapted to coact with the backing 4, prongs 9, and hooks 11, as before described.

When the facing is quite narrow as in the.

bicuspid shown in Figs. 10 to 12 inclusive, I I

find it sometimes ad 'antageous to only use ing-and the tooth permits the use .of a shorter'bite than'is now in common use:

It is evident that various changes maybe resorted to in the form, construction and arrangement of the several parts W1thout departing from the spirit-and scope of my invention, and hence I donot Wish to limit v 'myselfto the specific details herein shown and described except as they may be par- {:What I claim is:

ticularly set forth in the claims.

" 1. In an artificial tooth, afacing'having and .an undercut cavity, a backing provided with an edge-adapted to' 'coact with said ledge, and a hook arranged" to engage said avity for securing the facing tot-he back E2. In an artificial tooth,'a" facing having a beveled undercut ledge extending. across. the tooth and an undercutcavity, 'a qbacking provided With ai'beveled edge-adapted tocoact with said ledge and ahook arranged" to engage said cavity for securing the facing to the backing.

3. In anartifi'cial tooth, a facing'having an undercut ledge extending across the tooth and'und'ercut 'cavities,"and a backing proing to the backing.

videdWith an edge adapted to coact with said ledge and'aplura'lity of hooks arranged to engage said cavities for securing the fac- 4. In an artificial tooth, a facing having a beveled undercut ledge'extending across the coact with said ledge and a plurality of hooks arranged -to engage said cavities for securing the facing to the backing. I

5. In an artificial tooth,'a facing having an undercut ledge extending across the tooth, sockets in said ledge and an undercut cavity and a backing provided with an edge adapted to coact with said ledge, prongs for said socketsand'a hook arranged to engage said cavity for securing the facing to the backing.

6. In an artificial tooth, a facing having a beveled undercut ledge extending across the tooth, sockets in said ledge and 'an undercut cavity, and a backing provided with a beveled edge adapted to coact with said ledge, prongs for said sockets and a hookarranged to. engage said cavity for 1 I v securing the facing to the backing.

an undercut ledge extending across the tooth 7. In an artificial tooth, a facing having an undercut ledge extending across the tooth,

sockets in said ledge and undercut cavities, j

beveled undercut ledge extending across the tooth,sock etsin said ledge and undercut cavities, and a backing. provided with a-beveled edgeiadapted to coact; With said ledge,

prongs for said sockets and a plurality of hooks arranged to engage said cavities for securing the facing to'the backing.

In testimony, that I claim the foregoing as my invention, I have signed my name,

this seventh day of February, 1916.

JOSEPH P. GOMES. 

